Emergency call monitor
US6600811B1 · kind B1 · utility
5Cited by
9References
17Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 7, 1999 |
| Grant date | Jul 29, 2003 |
| Priority date | — |
| Expiry date | May 7, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04M11/04
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
An emergency call monitor (110) monitors the progression of a call in a telephone switching system. The sequence of called digits for a call is detected by a line/trunk interface unit (200). A call-type processor (202) determines whether the call is an emergency call by examining the sequence of called digits and examining a call-type associated with the call. If the call is an emergency call, then a call monitor (204) is initiated to monitor the progression of the call through the telephone switch. If errors are encountered during the call, an alarm (206), including a visual and/or audible indicator, is asserted.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.